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If you look closely, that button doesn't have a checked state. What is checked is the dropdown menu, not the button.

The lighting in case of recording or playing automation is custom created in Qt, and I don't think it can be customized by QSS.

It's a CSS limitation that QSS inherits: By having a cascading logic, the parents cannot be affected by the behavior of the children.
This limitation is sometimes a pain in web development as well. For those cases where CSS falls short we use JavaScript (usually JQuery which keeps the semantics of the calls in CSS but expanding it to affect parents).